How To Modify The Zama EL-42

[Genius]

And this is what you need to do that with......a set of micro drills and a pin vice.

View attachment 20721

Are you using a specific sized bit or just one to match the original hole?

 

[drf256]

Great mod Great One!

 

[srcarr52]

I've even had to drill the needle and seat hole larger on some carbs to supply the wet side of the carb with enough fuel. It would run good for about 1/2 cut and then lean out.

 

[Mastermind]

Are you using a specific sized bit or just one to match the original hole?

Sized to the original hole sir.

 

[Mastermind]

I've even had to drill the needle and seat hole larger on some carbs to supply the wet side of the carb with enough fuel. It would run good for about 1/2 cut and then lean out.

Happy Birthday dude.

 

[USMC615]

Nice info Randy...if I had 1/100th the knowledge you have...hell, I might be alright in the saw world. Appreciate the thread brother.

 

[srcarr52]

Happy Birthday dude.

Thanks chimp!

 

[Tor R]

And this is what you need to do that with......a set of micro drills and a pin vice.

View attachment 20721

Randy, did you buy this set on ebay, and if so where?

 

[Mastermind]

I really don't recall where I got it.....but a Google search will find some. If you need one shipped, let me know.

 

[Tor R]

I really don't recall where I got it.....but a Google search will find some. If you need one shipped, let me know.

i need to get an set so I can try this out on Zama el-42.
On saws I sell I would rather put an el-42 then 199.
It look to be a set like this:
http://www.ebay.co.uk/itm/20pc-Micr...586226?hash=item1c48b01f72:g:KYsAAOSwEetV~aty

 

[Mastermind]

That is the same set I have.

 

[Terry Syd]

I'm not familiar with the EL-42, but I noticed it also had a brass jet in the carb. Is that a limiting jet on the low speed circuit?

EDIT: With only the pictures you provided, it looks like the low speed needle may line up with that jet. If so, it is probably a limiting jet to the circuit (especially if it is only the standard .25mm).

Without pulling the welch plugs, it looks like the jet could feed two discharge holes, the idle hole and a subsequent auxiliary hole that may open at about 1/4 throttle (have to check inside the carb to confirm).

The low speed needle may only adjust the fuel coming into the idle circuit. However, the flow through the auxiliary discharge hole will be limited by the jet.

The jet looks like one of those jets that has the membrane valve underneath it. If you pull the jet you can confirm both the circuit and the kind of jet it is.

If it is an EPA limiting jet, then it could be an interesting experiment to drill it out one size larger. You can't just remove the jet like you can on a Walbro as the size of the jet will regulate the flow though the auxiliary hole.

 

[Terry Syd]

I sent a message to 'Poleman', he has a lot of experience in pulling these kind of jets, even has his own tool for it. Maybe he can chime in with some further information.

 

[Brush Ape]

Now after you drill it, use air pressure to blow all the swarf out.....

ouch

 

[Tor R]

That is the same set I have.

the set is so cheap, nice thing to have in the toolbox so I ordered one

 

[idiotwithasaw]

Would there be any advantage to drilling the hole out one size larger or would that supply too much fuel?

 

[Mastermind]

It's not needed....

 

[idiotwithasaw]

What can I say, my Tim Taylor came out. MORE POWER "grunt"

 

[Kevin White]

Thanks for the great thread Randy. I'm really enjoying this forum over others. No drama,just chainsaws.

 

[Mastermind]

Drama? Ain't nobody got time for dat.